Surf Server

MCP server for the Surf crypto data API. Dynamically generates tools from the OpenAPI spec — 12 grouped tools covering 86 endpoints across market data, wallets, social, on-chain queries, and more.

Quick start

Add to your MCP client config — no clone or install needed:

{
  "mcpServers": {
    "surf": {
      "command": "npx",
      "args": ["-y", "@surf-ai/surf-mcp"],
      "env": {
        "SURF_API_KEY": "your-api-key"
      }
    }
  }
}

Or with Bun:

{
  "mcpServers": {
    "surf": {
      "command": "bunx",
      "args": ["@surf-ai/surf-mcp"],
      "env": {
        "SURF_API_KEY": "your-api-key"
      }
    }
  }
}

Prerequisites

• A Surf API key (get one here)
• Node.js 20+ or Bun

Config file locations

• Claude Code: .mcp.json in project root or ~/.claude.json
• Claude Desktop: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
• Cursor: MCP settings in the IDE

Tools

The server exposes 12 tools, one per API domain. Each tool accepts a command and optional params:

Tool	Commands	Description
surf_market	price, ranking, etf, futures, options, fear-greed, liquidation-*, onchain-indicator, price-indicator	Market overview, rankings, indicators, ETF flows
surf_exchange	depth, klines, funding-history, perp, price, markets, long-short-ratio	Live exchange data from Binance, OKX, Bybit, etc.
surf_wallet	detail, transfers, history, net-worth, protocols, labels-batch	Wallet balances, transfers, DeFi positions
surf_token	holders, dex-trades, transfers, tokenomics	Token holder analysis, DEX trades, unlocks
surf_social	detail, user, user-posts, tweets, mindshare, ranking, smart-followers-history, tweet-replies, user-followers, user-following, user-replies	X (Twitter) social signals and sentiment
surf_project	detail, defi-metrics, defi-ranking	Project profiles, DeFi TVL/fees/revenue
surf_onchain	sql, tx, gas-price, schema, bridge-ranking, yield-ranking, structured-query	On-chain SQL queries, tx lookup, gas prices
surf_search	project, wallet, news, web, fund, polymarket, kalshi, airdrop, events, social-people, social-posts	Unified search across all data types
surf_prediction_market	kalshi-*, polymarket-*, matching-*, category-metrics	Polymarket and Kalshi prediction markets
surf_fund	detail, portfolio, ranking	Crypto VC fund profiles and portfolios
surf_news	feed, detail	Crypto news from major outlets
surf_web	fetch	Fetch any URL as clean markdown

Usage examples

Once configured, your AI assistant can use the tools directly:

"What's the BTC price?"        → surf_market({ command: "price", params: { symbol: "BTC" } })
"Check vitalik's wallet"       → surf_wallet({ command: "detail", params: { address: "vitalik.eth" } })
"Search for DeFi projects"     → surf_search({ command: "project", params: { q: "defi lending" } })
"Run an on-chain SQL query"    → surf_onchain({ command: "sql", params: { sql: "SELECT ..." } })
"ETH social sentiment"         → surf_social({ command: "detail", params: { q: "ethereum" } })

How it works

On startup, the server:

1. Fetches the OpenAPI spec from https://api.asksurf.ai/gateway/openapi.json (cached for 24h)
2. Groups all operations by their API tag
3. Registers one MCP tool per tag with auto-generated descriptions and command enums
4. Routes tool calls through @surf-ai/sdk for HTTP transport and auth

The server automatically picks up new API endpoints when the spec is updated — just restart.

Example: AI agent

The repo includes a simple agent that connects Claude to surf-mcp tools in an agentic loop. See examples/agent.ts.

ANTHROPIC_API_KEY=your-key SURF_API_KEY=your-key bun run examples/agent.ts "What's the BTC price and fear & greed index?"

Development

git clone https://github.com/asksurf-ai/surf-mcp.git
cd surf-mcp
bun install
bun run start                # Run the server
bun run typecheck            # Type check

License

MIT